Sub-ice colonial Melosira arctica in Arctic first-year ice

Sub-ice colonial Melosira arctica in Arctic first-year ice
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北极第一年冰中的冰下殖民地 Melosira arctica

DOI:
10.1080/0269249x.2013.877085
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发表时间:
2014
期刊:
影响因子:
1.8
通讯作者:
Poulin M
Poulin M
中科院分区:
生物学4区
文献类型:
--
作者:
Poulin M

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作为与极地海冰相关的三个主要藻类群落之一,2012年5月在加拿大北极高纬度地区中部努纳武特康沃利斯岛周围进行的实地考察期间记录了冰下群落的出现。仅在惠灵顿海峡近岸站观测到一次冰下群落(水深85 m,冰厚1.3 m,雪深<4 cm),形成长度< 10-15 cm的短链。该社区占主导地位的北方冷水为中心的硅藻,直链藻arcticaDickie,它形成了非常密集的聚集体的几个平行的,垂直排列的细胞链,紧紧地举行在一起的分泌物的粘液从rimoportulae阀面内的隆突。此外,还存在三种附生硅藻分类群,角毛藻,Synedropsis hyperborea(格鲁诺)Hasle,Medlin & Syvertsen和Pseudogomphonema arcticum(格鲁诺)Medlin。令人惊讶的是,除了这些附生植物,一些含中缝的硅藻也是这个冰下群落的一部分,在M.北极。
As one of the three main algal communities associated with polar sea ice, the occurrence of a sub-ice community has been recorded during a May 2012 field campaign conducted in the central Canadian High Arctic around Cornwallis Island, Nunavut. The sub-ice community was only observed once at the nearshore station in Wellington Channel (water depth: 85 m; ice thickness: 1.3 m; snow depth:<4 cm), forming short strands< 10–15 cm in length. The community was dominated by the northern cold water centric diatom,Melosira arcticaDickie, which formed very dense aggregates of several parallel, vertically aligned chains of cells, held tightly together by a secretion of mucilage from the rimoportulae on the valve face within the limit of the carina. In addition, three epiphytic diatom taxa were present,Chaetocerossp.,Synedropsis hyperborea(Grunow) Hasle, Medlin & Syvertsen andPseudogomphonema arcticum(Grunow) Medlin. Surprisingly, and in addition to these epiphytes, some raphe-bearing diatoms were also part of this sub-ice community, gliding over the colonial filamentous cells ofM. arctica.
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